3
1. CENTRAL HEATING THERMOSTAT
This thermostat controls the temperature of the water leaving the boiler for the heating system. For maximum output from the
radiators the thermostat should be left at maximum i.e. fully clockwise. If lower heating temperatures are required, turn the thermostat
anti-clockwise.
2. DOMESTIC HOT WATER THERMOSTAT
This thermostat controls the temperature of the domestic hot water leaving the boiler. For maximum hot water temperatures the
thermostat should be left at maximum i.e. fully clockwise. If lower temperatures are required, turn the thermostat anti-clockwise.
3. SELECTOR SWITCH
This control allows the boiler to provide central heating and hot water or hot water only.
Note: The mid position i.e. vertical, must not be selected. The internal clock and frost thermostat will not operate when the
switch is in the vertical position.
4. PRESSURE GAUGE
This indicates the central heating system pressure. It should always be within the green band when cold, increasing slightly
when hot.
If the pressure falls below the green band, ie lower red area, refer to the label on the front cover for guidance on re-pressurising
the system. Or contact your Installer to have the system checked and pressurised.
5. INDICATOR NEONS
When illuminated, the following conditions apply:-
Warning light (continuously on) - blocked flue or fan fault, contact your Service Engineer.
Overheat thermostat has operated - press white reset button (see Fig. 1) to reset (not applicable to Alpha 240P and 280P).
Electrical supply to the boiler is on.
Boiler is supplying hot water.
Boiler is supplying central heating.
When the red reset button ( ) is illuminated on the Alpha 240E and 280E it indicates that the burner has failed to light -
Press the red reset button (see Fig. 1) and the ignition sequence will restart (not applicable to Alpha 240P and 280P).
6. OVERHEAT THERMOSTAT
This thermostat automatically switches the boiler off in the unlikely event of the boiler overheating. When the thermostat
operates on the Alpha 240P/ 280P it turns the pilot off, when it operates on the 240E/280E the
neon is illuminated. Press the
white reset button (see Fig. 1) and the ignition sequence will restart automatically on the 240E/280E, for the 240P/280P the
pilot will have to be relit. Refer to the lighting instruction in section 4.
If this continually happens, contact your Service Engineer.
7. PRESSURE RELIEF VALVE
If the central heating system overheats and steam or water is discharged from the pipe connected to this valve, turn the boiler
off and contact your Service Engineer. Your Installer should have told you where this pipe terminates somewhere outside your
dwelling.
8. FROST THERMOSTAT
The boiler has a built-in frost thermostat, which automatically operates the boiler if the water temperature falls below 5°C,
providing the electrical supply neon
is illuminated and in the case of the Alpha 240P and 280P the pilot is alight.
3 BOILER CONTROLS
Alpha 240/280
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